System Overview

System overview

control module





The integrated audio module (IAM) handles functions for:
- Radio reception (AM and FM)
- CD playback
- AUX playback (not Performance)
- RDS reception
The integrated audio module (IAM) communicates with directly connected components as well as with other control modules and components via the MOST network, which is a fiber-optic communication network.
The integrated audio module (IAM) is a slave module on the MOST network. The infotainment control module (ICM) is the master module.
The integrated audio module (IAM) is mounted in the center console. It is integrated with the audio unit and they are replaced together.
In order to function in the MOST network, the infotainment control module (ICM) checks that the integrated audio module (IAM) has a correct serial number. If the number is incorrect, the integrated audio module (IAM) does not work.

The integrated audio module (IAM) is available in three versions:
- Integrated amplifier (Performance), with integrated radio, cd player and internal amplifier.
- Without integrated amplifier, with integrated radio and cd player. The version requires an external amplifier, Audio module (AUD). Subwoofer, Subwoofer module (SUB) available as accessory.
- Without integrated amplifier, with integrated radio and cd changer. The version requires an external amplifier, Audio module (AUD). Subwoofer, Subwoofer module (SUB) available as accessory.
RDS reception (Radio Data System) is possible with FM broadcasts (market-dependent). The system is called RBDS (Radio Broadcast Data System) in USA.
The Integrated Audio Module (IAM) manages playback of compressed music formats from cd (does not apply to Performance).
Support available for following formats:
- mp3
- wma.
The speakers that are installed in the front and rear doors are connected to the control module (applies to Performance) or an external amplifier, Audio module (AUD).
For more information about loudspeakers for the Audio module (AUD), see Design and function, Audio module (AUD).
The Integrated Audio Module (IAM) checks internal components, executed activations and input/output signals via its integrated diagnostics. If the control module detects a fault, a diagnostic trouble code is generated. Any diagnostic trouble codes are stored in the control module memory. The information can be read via the data link connector in the vehicle.

Signals
The table below summarizes the input signals to and output signals from the integrated audio module (IAM). Signal type is divided into directly connected signals and MOST communication. The illustration below depicts the same information plus Volvo's component designation.